Dissolution Process Observation of Methane Bubbles in the Deep Ocean Simulator Facility

Tsutomu Uchida, Ike Nagamine, Itsuka Yabe, Tatsunori Fukumaki, Ai Oyama, Brandon Yoza, Norio Tenma and Stephen M. Masutani
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Tsutomu Uchida: Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
Ike Nagamine: Hawaii Natural Energy Institute, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA
Itsuka Yabe: Japan NUS Co., Ltd., Tokyo 160-0023, Japan
Tatsunori Fukumaki: Japan NUS Co., Ltd., Tokyo 160-0023, Japan
Ai Oyama: Hawaii Natural Energy Institute, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA
Brandon Yoza: Hawaii Natural Energy Institute, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA
Norio Tenma: Research Institute of Energy Frontier, Department of Energy and Environment, AIST, Tsukuba 305-8569, Japan
Stephen M. Masutani: Hawaii Natural Energy Institute, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA

Energies, 2020, vol. 13, issue 15, 1-11

Abstract: To investigate the temperature dependency of the methane bubble dissolution rate, buoyant single methane bubbles were held stationary in a countercurrent water flow at a pressure of 6.9 MPa and temperatures ranging from 288 K to 303 K. The 1 to 3 mm diameter bubbles were analyzed by observation through the pressure chamber viewport using a bi-telecentric CCD camera. The dissolution rate in artificial seawater was approximately two times smaller than that in pure water. Furthermore, it was observed that the methane bubble dissolution rate increased with temperature, suggesting that bubble dissolution is a thermal activation process (the activation energy is estimated to be 9.0 kJ/mol). The results were different from the expected values calculated using the governing equation for methane dissolution in water. The dissolution modeling of methane bubbles in the mid-to-shallow depth of seawater was revised based on the current results.

Keywords: bubble dissolution; non-hydrate condition; temperature dependence; salinity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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